The computer writes electron configurations in the form, for Fe for example, [Ar]4s(2)3d(6)?

which we would write [Ar]4s23d6

Using the computer format give the electron configuration for


Because Co is right after Fe, it would normally contain 1 extra electron. But because it has a +3 charge, it is missing 3 electrons. So for Co it would normally look like [Ar]4s(2)3d(7) But because it is missing 3 electrons and it is easer to remove electrons from the s shell, it ends up looking like [Ar]3d(6)

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